PSG's Kylian Mbappe kicks the ball during the Champions League round of 16 second leg soccer match between Real Sociedad and Paris Saint-Germain, at the Reala Arena stadium in San Sebastian, Spain, on March 5, 2024. (PHOTO / AP)

SAN SEBASTIAN, Spain - Paris St Germain's Kylian Mbappe scored twice to lead them into the Champions League quarter-finals with a comfortable 2-1 win away to Real Sociedad in their last-16 second leg that wrapped up a 4-1 aggregate victory on Tuesday.

Bidding to win their first Champions League title, a disciplined PSG made the most of their chances from counter attacks, with the lightning fast Mbappe a constant menace.

After a remarkable group stage when they went unbeaten to finish ahead of last-year's finalists Inter Milan in Group D, LaLiga side Real Sociedad, who are struggling with injuries and have won one of their last 10 matches in all competitions, ran out of steam.

Mbappe was enjoying an inspired night and his speed and agility were too much for the hosts' defence to handle. He was virtually unstoppable down left channel and Tuesday's brace means he has scored 11 of PSG's last 15 Champions League knockout goals.

Paris Saint-Germain's Italian goalkeeper #99 Gianluigi Donnarumma dives for the ball during the UEFA Champions League last 16 second leg football match between Real Sociedad and Paris Saint-Germain (PSG) at the Anoeta stadium in San Sebastian on March 5, 2024. (PHOTO / AFP)

“We knew right away that we couldn’t go to sleep. If they had opened the scoring, they would have pushed on with their fans’ backing," Mbappe told Canal Plus.

"We had to dampen their hopes early on. That’s what we did, and we’re very happy to be back in the quarter-finals.”

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Mbappe created a couple of opportunities early on before scoring the opener with a fabulous curling strike in the 15th minute.

After receiving a long pass from Ousmane Dembele, he surged into the box, darting in from the byline and feigning to shoot, before shifting the ball out of his feet again and creating just enough space to fire a curling effort into the far corner.

The goal silenced a sold-out Reale Arena, who were seemingly stunned by the vision and technique of the France captain, who had a similar effort later denied by keeper Alex Remiro.

Paris Saint-Germain's Portuguese midfielder #17 Vitor Ferreira challenges Real Sociedad's French defender #24 Robin Le Normand during the UEFA Champions League last 16 second leg football match between Real Sociedad and Paris Saint-Germain (PSG) at the Anoeta stadium in San Sebastian on March 5, 2024. (PHOTO / AFP)

But Mbappe scored again in the 56th minute as he took a Lee Kang-in through ball in his stride before bursting into the box and beating the goalkeeper at his near post.

PSG seemed content to sit back against a tame Real Sociedad who carried little threat for most of the game.

They tried to make a late push, but were first denied by the post from a Martin Zubimendi strike and then by keeper Gianluigi Donnarumma who made a fine reflex save to deny Benat Turrientes from close range.

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Mikel Merino finally netted a consolation goal in the 89th minute with a deflected strike, but it was too little too late to prevent PSG reaching the Champions League quarter-finals for the first time in three years.